丹寨汞金矿床成矿构造地球化学模拟实验

位于贵州省内的丹寨汞金矿床是一典型卡林型金矿床。矿床赋在于上寒武统含有机质的海相泥质碳酸盐岩之中。成矿元素Ａｕ、Ｈｇ、Ａｓ、ｓｂ、Ｂａ密切共生，但汞矿体与金矿体的产出有一定分离。金为微细粒自然金，它与黄铁矿、含砷黄铁矿和粘土矿物有关，在碳质物中，金含量也可提高。有机质（有机碳和沥青）与Ｈｇ－Ａｕ矿化有一定关系。矿床受构造控制明显，矿体主要产出在具压性、压扭性特征的多次构造活动造成的破碎带之中。成矿作用主要是在中低温（１１０－２９０℃）和低压条件下进行的。

EXPERIMENTS SIMULATING THE TECTONIC GEOCHEMISTRY OF THE Hg-Au DEPOSIT OF DANZHAI, GUIZHOU, CHINA

The Hg-Au deposit in Guizhou is found in the carbonaceous and pelitic carbonate rocks of the Upper Cambrian. The gold mineralization is very similar to the Carlin-type gold deposit. The ore-forming elements are Au, Hg, Sb, As and Ba. The gold in the ores is micrograined and related to pyrite, organic carbon, and clay minerals. The Hg-Au mineralization is structurally controlled forming at conditions of low to middle temperatures (110-290℃) and relatively subsurface low pressures.In order to broaden the study on the mechanisms of formation of the Hg-Au deposit, the experimental studies of geochemical behaviors of the ore-forming elements on stress-strain field have been carried out in the laboratory. Structural and geochemical controls on the migration and enrichment of Au, Hg, Sb, As and organic matter were investigated. The analytic results observed by microprobe in the experimental speciments duplicate some of the regularities of the Hg-Au mineralization and provide important experimental evidence for further study of Hg-Au mineralization.